Can someone
please help me or point me in the right
direction. When running my application memory usage increases slowly
by about 6mb / hour. Commenting out the function digital
signature validation routing ValidateSig() stops the memory increase.
a) I am getting no
errors, so the leak can is not inside my "catch"
constructs.
b) I am using the
MS Crypto api .. (is that
relevant??)
c) I am linking to
xerces-c_2_6.dll [release] and xsec_1_2_0.dll [release] with no
XALAN support on Windows 2003 compiled with
VS2003.net
I have looked up
& down this source and can see no obvious mistakes!
Can anyone help me
please?
BOOL
ValidateSig()
{
//
// parse the XML document,
load in the signature field and attempt to validate it using a copy of
the
// X509 public key we create earlier from the
certificate store.
//
BOOL valid =
FALSE;
try
{
XercesDOMParser
parser;
parser.setDoNamespaces(true);
parser.setCreateEntityReferenceNodes(true);
parser.setDoSchema(true);
MemBufInputSource *memIS = new MemBufInputSource((const XMLByte
*)buffer, bufferLen, "XSECMem",
false);
parser.parse(*memIS);
delete memIS;
// destroy as soon as possible
if(parser.getErrorCount() > 0)
{
Display( "Error parsing input
document", "error in XML parse", buffer, bufferLen) );
return FALSE;
}
// Now create a signature object to validate the
document
XSECProvider
prov;
DSIGSignature *sig =
prov.newSignatureFromDOM(parser.getDocument());
sig->registerIdAttributeName(config.idAttributeName);
sig->registerIdAttributeNameNS(config.idAttributeNS,
config.idAttributeName);
sig->load();
sig->setSigningKey(X509->clonePublicKey());
if(sig->verify())
{
Display(_T("Signature
Valid...OK"));
valid = TRUE;
// the only way to set this is if this fn() is
successfull
}
else
{
char *err =
XMLString::transcode(sig->getErrMsgs());
Display("Error parsing [or]
validating document", err, buffer,
bufferLen);
XSEC_RELEASE_XMLCH(err);
Display("Error parsing [or] validating
document\n%s", sig->getErrMsgs());
}
prov->releaseSignature(sig);
}
catch(XSECException &e) //
signature related errors
{
char *err =
XMLString::transcode(e.getMsg());
Display( "An error occured during
signature load", err, buffer, bufferLen);
XSEC_RELEASE_XMLCH(err);
Display(_T("An error occured during
signature load\n%s", e.getMsg()); // e.getMsg() is WIDE
}
catch(const XMLException &e) // xml related
parsing errors
{
char *err =
XMLString::transcode(e.getMessage());
Display("An error occured during
xerces parsing and loading of xml", err, buffer, bufferLen);
XSEC_RELEASE_XMLCH(err);
Display( _T("An
error occured during xerces parsing and loading of xml\n%s"),
e.getMessage()); // e.getMessage() is WIDE
}
return valid;
}
// XSec startup code && x509
constuction.. dont think its relevant here.
SomeConstructor()
{
//
startup xerces & xsec for signature validation
//
because parts of the Apache signature library are not thread safe -
all initialisation
// now takes place inside the constructor
- rather than the preferred Init() method.
// i NEVER
destroy the cryptoProv object... it is owned by XSEC and is killed vie
XSECPlatformUtils::Terminate()
//
try
{
// initialize xerces xml parser and the Apache
XML-Security library
XMLPlatformUtils::Initialize();
XSECPlatformUtils::Initialise();
cryptoProv = new WinCAPICryptoProvider(NULL, NULL,
0);
XSECPlatformUtils::SetCryptoProvider(cryptoProv);
// this is set "globally"
}
catch(const
XMLException &e)
{
throw; //
rethrow..to waiting handler
}
}
BOOL CreateX509()
{
//
// load the public key from the certificate store.
//
install the key as a service certificate using
mmc->certificates->services certificate,
// browse
for the "microsoft firewall" and install the cert in the Trusted Root
Authority.
// For example the "microsoft firewall" uses the
storeName L"fwsrv\Root"
//
HCERTSTORE certStore = NULL;
PCCERT_CONTEXT certContext = NULL;
DWORD
certOpenFlags = CERT_STORE_OPEN_EXISTING_FLAG |
CERT_SYSTEM_STORE_SERVICES |
CERT_STORE_READONLY_FLAG;
// open the store .. fail if the store
does not exist, look in the services store, open for
readonly
certStore = CertOpenStore(CERT_STORE_PROV_SYSTEM,
0, NULL, certOpenFlags, config.storeName);
if(certStore ==
NULL)
{
_com_error
e(GetLastError());
return FALSE;
}
// find signer's certificate
certContext = CertFindCertificateInStore(certStore,
(PKCS_7_ASN_ENCODING | X509_ASN_ENCODING), 0, CERT_FIND_SUBJECT_STR,
config.signerName , NULL);
CertCloseStore(certStore, 0); //
close the store regardless
if(certContext == NULL)
{
_com_error
e(GetLastError());
return FALSE;
}
try
{
if(X509 !=
NULL) // if we have already been created .. then destroy and
re-create
delete
X509; // X509 destructor takes care of
CertFreeCertificateContext()
X509 = new
WinCAPICryptoX509(certContext, cryptoProv->getProviderRSA(),
cryptoProv->getProviderDSS());
}
catch(XSECCryptoException &e)
{
delete X509;
return FALSE;
}
return TRUE;
}
